/Engine/Source/Runtime/NavigationSystem/Public/NavigationData.h
don't make this function virtual! Look at implementation details and its comments for more info.
true if line from RayStart to RayEnd is obstructed
bool Raycast ( const FVector & RayStart, const FVector & RayEnd, FVector & HitLocation, FSharedConstNavQueryFilter QueryFilter, const [UObject](API\Runtime\CoreUObject\UObject\UObject) * Querier ) const